CN203534929U - Non-contact solid matter density detector - Google Patents
Non-contact solid matter density detector Download PDFInfo
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- CN203534929U CN203534929U CN201320684686.1U CN201320684686U CN203534929U CN 203534929 U CN203534929 U CN 203534929U CN 201320684686 U CN201320684686 U CN 201320684686U CN 203534929 U CN203534929 U CN 203534929U
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Abstract
The utility model relates to a non-contact solid matter density detector. A gas compressor is connected with a solid matter accommodating container; the solid matter accommodating container is connected with an open water accommodating container via a valve and an airtight water accommodating container; a second weighing sensor is mounted at the lower end of the open water accommodating container; the second weighing sensor is connected with a first weighing sensor via a measurement circuit, and the first weighing sensor is mounted at the bottom of the solid matter accommodating container. According to the utility model, the change of air pressure in the container is converted into the change of gravity of water in the container; within the pressure bearing range of the solid matter accommodating container, the measurement accuracy can be better improved by properly increasing the initial air pressure of the solid matter accommodating container, so that the damage to a to-be-detected object and error caused by the Archimedes' Principle are overcome, and the measurement result is more accurate; the non-contact solid matter density detector is simple in structure the measurement method is simple and convenient, and the operation is convenient.
Description
Technical field
The utility model relates to a kind of arbitrary shape density measuring device for solid materials, specifically the solid matter density measuring equipment of contactless not tested person liquid restriction.
Background technology
Density is a very important physical quantity, and there is important value in a lot of fields.For the density of measuring solid matter, there are a variety of metering systems, for example radioactivity principle mensuration, microwave technology mensuration and Archimedes's mensuration.Relatively more conventional is Archimedes's indirect method of measurement, but the method has very large defect and deficiency, is exactly that measured matter must contact with the liquid of test use.
According to density calculation formula:
crucial quality and the volume that will measure accurately solid matter.For the mensuration of solid masses, can measure by LOAD CELLS in the market, and for the volume of irregular solid matter, cannot directly record, be generally to adopt the method for direct discharging liquid to measure.And the drainage that the disclosed density of solid tester of CN2807247Y adopts, because measured object will directly contact with the liquid of test use, therefore can not guarantee the accuracy of its measurement.For some solid matters, on the one hand this liquid generation chemical reaction used with test likely, brings larger error to test result.Also very possible this solid matter can absorb this kind of liquid on the other hand, causes the expansion of solid volume generation certain scale, to measurement result, brings larger error.Although one piece of method that is entitled as the gas differential pressure of a < < new irregular entity density method of measuring > > paper employing delivering on instrument and meter for automation journal has realized non-contact measurement, but the sensitivity of current pressure transducer and precision are not high, its measuring error is: 10%FS, causes measuring result error larger.
Summary of the invention
The purpose of this utility model is just to overcome above-mentioned the deficiencies in the prior art, and a kind of contactless solid matter measurement mechanism of not tested person liquid restriction is provided.
The utility model is achieved through the following technical solutions:
Contactless solid matter density tester, to be connected with solid matter container 1 by pipeline by gas compressor 13, solid matter container 1 is connected with uncovered water container 3 with airtight water container 2 by hard conduit 4, valve 5, uncovered water container 3 bottoms are equipped with the first LOAD CELLS 6 that the second LOAD CELLS 7, the second LOAD CELLS 7 are equipped with through metering circuit 14 and solid matter container 1 bottom and are connected and composed.
Described metering circuit 14 is through single-chip microcomputer 11 and module 10, to be connected respectively the first amplifier 8 and the second amplifier 9 forms respectively by liquid crystal display 12 and interface circuit, and system power supply is powered to modules respectively.
This programme has been used two sensors, and one is for surveying the first LOAD CELLS 6 of solid masses, and another is for measuring the second LOAD CELLS 7 of quality in uncovered water container 3.
The first LOAD CELLS 6 of solid matter container 1 bottom is for measuring the weight of solid matter, the analog quantity recording is sent to the first amplifier 8 by data line and amplifies, through AD7705 module 10, carry out analog to digital conversion afterwards, the data after conversion are sent to single-chip microcomputer 11 and show by LCD display 12.
The second LOAD CELLS 7 of the bottom of uncovered water container 3 is for detection of the variation of the weight of water in this container, and the data that record are successively through the second amplifier 9, AD7705 module 10 and single-chip microcomputer 11, and shows by LCD display 12.
Beneficial effect: in to the indirect measurement of solid matter volume, by the change transitions of container internal gas pressure, to be the variation of the gravity of water in container, as long as within the scope of the pressure bearing of solid solid matter container, suitably strengthen the initial gas pressure of solid solid matter container, just can improve well and measure accurate precision.Entirely can be to arbitrary shape, the density of any solid solid matter is carried out noninvasive measurement.Overcome that Archimedes direct drainage brings to the damage of measured object and the error that causes thus.Complete owing to having got rid of not high enough the brought error of test liquid and Pressure Sensor Precision, make the result that records more accurate.Apparatus structure is simple, and measuring method is simple, rapidly, measures accurately, easy to operate.
Accompanying drawing explanation
Accompanying drawing 1 is contactless solid matter density tester structural drawing
Accompanying drawing 2 is testing circuit structured flowcharts of accompanying drawing 1
Accompanying drawing 3 is whole man-machine interface implementing circuit figure
Accompanying drawing 4 is A/D hardware circuit implementing circuit figure
Accompanying drawing 5 is Single Chip Microcomputer (SCM) system implementing circuit figure
Accompanying drawing 6 is Amplifier Design circuit diagrams
Accompanying drawing 7 is LOAD CELLS bridge circuits
1 solid matter container, 2 airtight water containers, 3 uncovered water containers, 4 hard conduits, 5 valves, 6 first pressure transducers, 7 second LOAD CELLS, 8 first amplifiers, 9 second amplifiers, 10AD module, 11 single-chip microcomputers, 12 liquid crystal displays, 13 gas compressors, 14 metering circuits
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
The utility model is to utilize measured object shared volume in regulation container, when passing into a certain amount of gas, indirectly records the volume of measured object by gas to discharging the volume size of water, and quality is directly by LOAD CELLS, to record, according to density formula:
just can try to achieve material density.
This physical quantity of density is defined as the ratio of quality m and volume v, and the physical quantity that needs thus to measure just has quality m and the volume v of measured object, and wherein trying to achieve of quality m can be realized by the higher LOAD CELLS of precision.As shown in Figure 1, first measured object is put into solid matter container 1, the second LOAD CELLS 7 that is placed in solid matter container 1 bottom is sent to the data of the first amplifier 8 after row amplifies by the simulating signal detecting and carries out analog to digital conversion through AD7705 module 10, the digital signal converting is input to single-chip microcomputer 11 and processes, and the data after processing are the mass M of measured object.Afterwards, solid matter container 1 is sealed, then valve-off 5, open gas compressor 13 air of ormal weight is pressed in solid matter container 1, then close gas compressor 13, open valve 5.Now the air pressure in solid matter container 1 can be pressed into the water in airtight water container 2 in uncovered water container 3, now the weight of the water in uncovered water container 3 changes, its weight is by the second LOAD CELLS 7 perception, the signal perceiving is sent to single-chip microcomputer 11 and carries out data processing after the second amplifier 9 and AD7705 module 11, and the data after processing are M2.
Because the gas flow being passed in solid matter container 1 is constant at every turn, so can record in advance while not putting into measured object, when passing into the gas of ormal weight, according to above-mentioned steps, can record the weight of water in uncovered water container 3, be designated as M1, can draw the volume of measured object by shifting onto, its volume computing formula is as follows:
The density that can be obtained measured object by formula (1), (2) is:
As shown in Figure 1, airtight water container 2 amounts of being filled with water are more but a fixed gap is left on top, and be closed container, top is communicated with material container 1, middle part is communicated with uncovered water container 3, wherein the water liquid level of uncovered water container 3 and airtight water container 2 is identical, uncovered water container 3 open tops.Complete when measuring, while opening material container 1, for keeping the identical of liquid level in airtight water container 2 and uncovered water container 3, the water being entered by air in uncovered water container 3 can flow back to again airtight water container 2 naturally.
As shown in Figure 4, adopt 16 double channel A/D 7705 modules 10 as analog to digital converter, its precision can reach the requirement of measurement completely.
The first LOAD CELLS 6 is connected with the first amplifier 8, and the second LOAD CELLS 7 is connected with the second amplifier 9, adopts unipolarity input.Because the Full-span output of the second LOAD CELLS 7 is 5mv, therefore the OP07 of available Low-offset voltage builds two-stage amplifying circuit, at different levelsly all amplifies 10 times.Voltage range after amplification is: 0～500mv, the signal after amplification is transferred to AD7705 module 10 and carries out analog to digital conversion.Shown in accompanying drawing 3, be the connecting circuit of AD7705 module 10 and single-chip microcomputer 11.
The bridge circuit of the second LOAD CELLS 7 as shown in Figure 7, adopts resistance strain type pressure sensor, is subject to the manufacture of itself and the impact of environment, can produce the error of 5%FS left and right.
The attached connecting circuit that Figure 3 shows that LCD liquid crystal display 12 and main control singlechip 11.In the selection of LCD liquid crystal display 12, adopted LCD12864, this display screen is easy to use.
Single-chip microcomputer 11 has adopted the AT89S52 of Atmel company, and it has the FLASH of 8k byte, the RAM of 256 bytes, and 3 16 bit timings/counters, can complete the various measurement requirements of this surveying instrument completely.
According to formula (3), verify, for volume, be: 10*10*5cm
3=500cm
3rectangle solid iron, by metering circuit, record its mass M=2340.3g, record M1=102.3g, M2=403.4g, bring formula into and obtain:
The weight of M measured object in formula, M1 be sensor detect do not put into measured object time container 3 the weight of water, M2 is the weight of container 3 water while putting into measured object.
By above calculating, verify, the result drawing is the density of iron really, is therefore proved that this utility model is in correctness and the accuracy measured in solid matter density.
Claims (2)
1. a contactless solid matter density tester, it is characterized in that, to be connected with solid matter container (1) by pipeline by gas compressor (13), solid matter container (1) is connected with uncovered water container (3) with airtight water container (2) by hard conduit (4), valve (5), the second LOAD CELLS (7) is equipped with in uncovered water container (3) bottom, and the first LOAD CELLS (6) that the second LOAD CELLS (7) is equipped with through metering circuit (14) and solid matter container (1) bottom connects and composes.
2. according to the contactless instrument for detection of solid density of solid claimed in claim 1, it is characterized in that, described metering circuit (14) is through single-chip microcomputer (11) and AD module 10, to be connected respectively the first amplifier (8) and the second amplifier (9) formation by liquid crystal display (12) respectively with interface circuit, and system power supply is given respectively each module for power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684686.1U CN203534929U (en) | 2013-11-02 | 2013-11-02 | Non-contact solid matter density detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684686.1U CN203534929U (en) | 2013-11-02 | 2013-11-02 | Non-contact solid matter density detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203534929U true CN203534929U (en) | 2014-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320684686.1U Expired - Fee Related CN203534929U (en) | 2013-11-02 | 2013-11-02 | Non-contact solid matter density detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203534929U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697890A (en) * | 2015-02-13 | 2015-06-10 | 刘立帅 | Relative density rapid detector for jewel and jade and using method of rapid detector |
| CN105954145A (en) * | 2016-06-25 | 2016-09-21 | 袁林 | Gold density measurement instrument and method for measuring density of object by virtue of gold density measurement instrument |
-
2013
- 2013-11-02 CN CN201320684686.1U patent/CN203534929U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697890A (en) * | 2015-02-13 | 2015-06-10 | 刘立帅 | Relative density rapid detector for jewel and jade and using method of rapid detector |
| CN105954145A (en) * | 2016-06-25 | 2016-09-21 | 袁林 | Gold density measurement instrument and method for measuring density of object by virtue of gold density measurement instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20141102 |
|
| EXPY | Termination of patent right or utility model |